Method and apparatus for supporting RACH-less mobility with pre-allocated beams in wireless communication system
摘要
說明書
When the RACH-less HO is configured, after the UE has received UL grant, the UE sends the RRCConnectionReconfigurationComplete message (C-RNTI) to confirm the HO, along with an UL BSR, whenever possible, to the target eNB. The target eNB verifies the C-RNTI sent in the RRCConnectionReconfigurationComplete message. The target eNB can now begin sending data to the UE. The HO procedure is completed for the UE when the UE receives the UE contention resolution identity MAC control element (CE) from the target eNB.
Connected mode mobility is described. It may be referred to Section 5.3.1.3 of 3GPP TS 36.331 V15.0.1 (2017 December). An operation of UE in RRC_CONNECTED for mobility (e.g. HO) is described.
In RRC_CONNECTED, the network controls UE mobility, i.e. the network decides when the UE shall connect to which E-UTRA cell(s), or inter-RAT cell. For network controlled mobility in RRC_CONNECTED, the primary cell (PCell) can be changed using an RRCConnectionReconfiguration message including the mobilityControlInfo (HO), whereas the secondary cell(s) (SCell(s)) can be changed using the RRCConnectionReconfiguration message either with or without the mobilityControlInfo.
In DC, an SCG can be established, reconfigured or released by using an RRCConnectionReconfiguration message with or without the mobilityControlInfo. In case random access to the primary SCell (PSCell) or initial PUSCH transmission to the PSCell if rach-SkipSCG is configured is required upon SCG reconfiguration, E-UTRAN employs the SCG change procedure (i.e. an RRCConnectionReconfiguration message including the mobility ControlInfoSCG). The PSCell can only be changed using the SCG change procedure and by release and addition of the PSCell.
